An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory
In this study, the homogenous and anisotropic locally rotationally symmetric (LRS) Bianchi type-I universe filled with the bulk viscous and the string cloud matter has been investigated in the Brans-Dicke (BD) scalar-tensor theory. The modified Einstein field equations of the constructed model have...
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Naim Çağman
2023-09-01
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| Series: | Journal of New Theory |
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| Online Access: | https://dergipark.org.tr/en/download/article-file/3373303 |
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| author | Halife Çağlar |
| author_facet | Halife Çağlar |
| author_sort | Halife Çağlar |
| collection | DOAJ |
| description | In this study, the homogenous and anisotropic locally rotationally symmetric (LRS) Bianchi type-I universe filled with the bulk viscous and the string cloud matter has been investigated in the Brans-Dicke (BD) scalar-tensor theory. The modified Einstein field equations of the constructed model have been solved by using the relation of the scale factors $A=B^m$ and considering the deceleration parameter to be $q=m-1$. It is found that the string does not survive for the model due to the obtained zero string energy density ($\rho_s=0$) and agrees with some studies in recent years. Moreover, it is possible to say that string matter may be turned into phantom energy over time, depending on the obtained negative rest energy density of the matter. When BD scalar field $\Phi$ is assumed constant, the attained solutions are reduced to General Relativity (GR) solutions for the static vacuum. Thus, the constructed model has not allowed the reduction of the BD solutions to GR solutions, including the matter distributions. In addition, some expansion models for choosing a value of constant $m$ have been obtained and provided. All the results have been analyzed in detail. |
| format | Article |
| id | doaj-art-79dbd1aa64904d72924524b136b4aeeb |
| institution | DOAJ |
| issn | 2149-1402 |
| language | English |
| publishDate | 2023-09-01 |
| publisher | Naim Çağman |
| record_format | Article |
| series | Journal of New Theory |
| spelling | doaj-art-79dbd1aa64904d72924524b136b4aeeb2025-08-20T03:10:56ZengNaim ÇağmanJournal of New Theory2149-14022023-09-0144879610.53570/jnt.13524702425An Investigation into LRS Bianchi I Universe in Brans-Dicke TheoryHalife Çağlar0https://orcid.org/0000-0003-2877-1221CANAKKALE ONSEKIZ MART UNIVERSITY, BİGA VOCATIONAL SCHOOLIn this study, the homogenous and anisotropic locally rotationally symmetric (LRS) Bianchi type-I universe filled with the bulk viscous and the string cloud matter has been investigated in the Brans-Dicke (BD) scalar-tensor theory. The modified Einstein field equations of the constructed model have been solved by using the relation of the scale factors $A=B^m$ and considering the deceleration parameter to be $q=m-1$. It is found that the string does not survive for the model due to the obtained zero string energy density ($\rho_s=0$) and agrees with some studies in recent years. Moreover, it is possible to say that string matter may be turned into phantom energy over time, depending on the obtained negative rest energy density of the matter. When BD scalar field $\Phi$ is assumed constant, the attained solutions are reduced to General Relativity (GR) solutions for the static vacuum. Thus, the constructed model has not allowed the reduction of the BD solutions to GR solutions, including the matter distributions. In addition, some expansion models for choosing a value of constant $m$ have been obtained and provided. All the results have been analyzed in detail.https://dergipark.org.tr/en/download/article-file/3373303lrs bianchi i universebrans-dicke theorybulk viscousstring clouddeceleration parameter |
| spellingShingle | Halife Çağlar An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory Journal of New Theory lrs bianchi i universe brans-dicke theory bulk viscous string cloud deceleration parameter |
| title | An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory |
| title_full | An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory |
| title_fullStr | An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory |
| title_full_unstemmed | An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory |
| title_short | An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory |
| title_sort | investigation into lrs bianchi i universe in brans dicke theory |
| topic | lrs bianchi i universe brans-dicke theory bulk viscous string cloud deceleration parameter |
| url | https://dergipark.org.tr/en/download/article-file/3373303 |
| work_keys_str_mv | AT halifecaglar aninvestigationintolrsbianchiiuniverseinbransdicketheory AT halifecaglar investigationintolrsbianchiiuniverseinbransdicketheory |